Platen printing machine



April 8 1924. 1;4s9,sos

A. WILDEN PLA'IEN PRINTING MACHINE Filed July 6. 1922 s Sheets- Sheet 1 Wifn es'ses: Inyenbr;

M EM+ Aprifi 8 1924.

I A. WILDEN PLATEN PRINTING MACHINE Filed July 6. 1922 3 Sheets-Sheet 2 for:

April 8 19241, 1,489,805 4 A. WILDEN PLATEN PRINTING MACHINE Filed July 6. 1922 3 Sheets-Sheet 5 5-; Inventor: M

Patented Apr. 8, i324,

entree stares ALBERT WILDEN, OF COLOGNE, GERMANY.

ELATEN PRINTING MACHINE.

Application fi1ed July 6,

To (all whom it may concern:

Be it known that I, Annual lVILDEN, a German subject, residing at Cologne, Germany, have invented new and useful 111% rovements in Platcn Printing Machines, of which the following is a specification.

This invention relates to platen printing machines with vertically movable printing platen which is characterized by the simplicity of its construction and easy operation so that it can be used by unskilled persons.

In a previous machine invented by this applicant, the color printing was carried out by means of a ribbon; this, however, had the disadvantage that the print was not sharp; that in consequence of the various forms of ribbon in useand the uneven use of same smudges were produced, while at the same time the expensive color ribbons became quickly worn and the working expenses were too high.

Consequently, it was necessary to devise means for printing in colors without the use of ribbons by providing reciprocatory inking rollers adaptedv to convey the required colors from laterally disposed ink troughs. However, experience has proved that this leads to particular difficulties for the reason that the alternate forward and backward motion of the inking rollers had to be carried out quickly and in definite periods through the intervention of a comparatively slow rotary engine shaft which turns in the one direction only, while, further. there is but little space available for the mounting of the necessary gear.

The aforesaid objections are entirely avoided by the present invention. Moreover, the color mechanism is so arranged as to ensure an intensive and uniform application of colors.

The improved printing press is shown in the accompanying drawings by way of example and wherein:

Figure 1 is a longitudinal section of the printing press; 2 a sectional plan and Fig. 3 a cross section of same.

The printing platen 1 carrying the type receives alternate up and down mot-ion through the intervention of eccentrics 3 on shaft 2. The platen is suitably guided by means of guide rods 1 depending from the platen and working in sleeves 5 of the bed frame. The paper 6 for printing is drawn from a roller and passes horizontally along over a rubber plate 7 secured on a press Serial No. 573,166.

table 8 in such a manner that the downmoving type platen, previously inked, produces the impression. The intermittent advance of the paper from the roll is carried out by any suitable mechanism not shown here. The inking of the type is carried out in the following manner:

In two rails 9, one at each side of the press, is carried the so-called inking carriage e5 10 provided with two inking rollers 11 and receiving an appropriate to and fro mot-ion. On the left hand side of the press is an inking mechanism which imparts the ink to the inking rollers 11 previous to each impres- 7 sion. The inking mechanism will be hereinafter described. The gear for reciprocating the inking carriage comprises a grooved cam 12 fixed on the main shaft of the press and engaging a pin 36 of a toothed-rack 13 in 7 such a manner as to move said toothed-rack by a definite length forward and rearward during each complete revolution of the shaft. The toothed-rack 13 rotates a pinion 14 and thereby also imparts alternate rot-ation in opposite directions to two chain wheels 15 which, by means of a chain 16, cause the ink-carriage 10 to advance and retreat below the type for inking purposes.

The following is a description of the inking mechanism:

In the ink trough 17 is freely mounted a steel roller 18 furnished with the usual doctor 19 for regulating the film of ink. The

ink trough with its 'roller is so mounted in so the side walls of the inking mechanism as to have a slight horizontal play and it is ordinarily drawn outwards by a spring 20. Thus, only when a pin 21 on the toothwheel 22, before each impression, (or before as each second impression), moves the ink trough slightly to the right, can the roller 18 contact for a short time with the gelatine roller 23, continuously driven by the shaft 2, and thereby ink the roller 23. The

ink on roller 23 is then spread evenly by a roller 25 which is carried by a link 24 which swings on the shaft 26 of the roller 23.

The steel roller 25 receives, besides the continuous rotation, a gradual sidewise disi as to form an angular head 37, while a no spring 27 at the opposite end presses the roller against a stationary pin 28, whereby spread over the inking rollers 11.

The platen 1 or" the press consists in a trains-like box the bottom 29 of which is out a at 30 in order to allow the type 81 to pass through in the downward d' Fig. l, right-hand side. The furnished with a 1 32 for holding the t, e 31, These type rest With a smell projection upon the upper sid of the sticks These sticks are placed side by side in the type box so that the total width can be arranged to suit any desired Width of line. The sticlrs are holow and composed of thin Walls furnished at both ends with rectangular slides 33 which can be moved to and fro by means of upwardly projecting pins 3 the two slides thus enabling the type set up in-tne sticks to be clamped therein at any suitable position. This is an advantage ensuring it quick and setting up of the type in each. stick. F or securely retaining the slides in any position they are fitted at their underside with a fiat spring 35 which presses and slides along the bottom of the stick.

I claim:

1. A fiat printing press with color mechanisin and reciprocating ink-carriage, chemoterized in that the reciprocating movement of the ink carriage is obtained through the intervention of a nniforn'il y rotating shaft which by its rotation actnates e reciprocatory toothed-reel: Which latter actnates 2t chain and chain Wheel drive adapted to induce at the required period, the to and fro nioven'ient off the inl -c rriege that is to say, the inking of the printing type.

2. Constructionel form of the press ecno to clztirn 1, characterized in tint the two zidjscently mounted inking; rollers of the ink carriage are reteineth in the idle position of the inlr carriage, between two vertically superposed spring controlled continues rotating rollers of the inking incclioni whereby on the one hand, the is stopped in its idle posi tion during the printing operation and on the other hand ink is sin'inltsneonsly applied during; this period to the two inking rollers.

3. A constructional form of the press according to claims 1 2nd 2, characterized in hit the necessary latera distribution or" the i 1: upon the inking rollers is elle d b the movement of one or more ink carrying .OllGl'S (Wing to the feet that the upper nd if desired also the lower of the two verilly superposed ink carrying rollers have heir ends cut away at angle and are spring pressed against a stationary pin.

ALBERT WlLDENQ 

